Vulgar (adjective)

1. Not in good taste, lacking in refinement, coarse, or uncultivated.
2. Offensive or indecent in language or behavior.
3. Commonplace, ordinary, or of little value.

Origin:

Middle english, from latin vulgaris, from vulgus the common people.

Examples:

1. The comedian's vulgar jokes were not well received by the audience.
2. The movie's vulgar language and violence earned it an adult rating.
3. The party was ruined by the guest's vulgar behavior.
4. His vulgar display of wealth was seen as tasteless and crass.
5. The vulgarity of the political campaign was a disappointment to many voters.